Ah, well, put two black Y connetors on the sides of one white connector, attach grey rods onto the Y connectors, and you have your fireing pin. Is this you first instructable? If yes, very good. However, I have noticed that it uses A LOT of the same pieces from other guns like the stock is from the Knex Easy Shotgun and the handle is from Gorkem's sniper. Although, the barrel is all yours.